Tamron already developing lenses that will resolve the almost 50 Megapixels of Sony's new sensor.

This is from Sonyalpharumors, but they quote it as a "very good Tamron source":
'Tamron is working on a new SP.2 lens line. It is made to resolve the High resolution Full Frame sensors coming from Sony. In detail Sony told Tamron that it’s “around” 46 megapixel.
– The 15-30mm f/2.8 DI VC USD lens Tamron announced at Photokina is the first of the new SP.2 line. It will work fine on those new Sony ≈50MP FF cameras.
– Tamron is also working on the design of two prime lenses that can resolve such a resolution.'

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